Socioeconomic and usage characteristics of transportation network company (TNC) riders

Transportation - The widespread adoption of smartphones followed by an emergence of transportation network companies (TNC) have influenced the way individuals travel. The authors use the 2017...     

Understanding Recreational Boater Attitudes to Zoning in a Proposed Marine Protected Area

Although the success of marine protected areas (MPAs) and associated zoning schemes is largely dependent on stakeholder acceptance and support, there have been relatively few studies examining the response of recreational stakeholders to MPA proposals. This study investigates the response of recreational boaters to a proposed MPA in British Columbia, Canada. Using a structured questionnaire (n = 543) and a focus group (n = 6), the research examines the level of support for the concept of marine zoning and identifies key factors influencing support or opposition. Results indicate that a small majority of recreational boaters support the concept of marine zoning, but that there are areas of concern that ought to be addressed as MPA implementation proceeds. Support for zoning was strongly related to perceived benefits, particularly environmental benefits. Furthermore, perceived benefits overall were found to outweigh concerns as determinants of recreational boater support for zoning. Major dimensions of opposition included perceptions of over-regulation, loss of access for boating, and mistrust of the government. A suggestion is that such concerns may be mitigated through focused communication and meaningful involvement of boaters in the zoning process.     

开心一刻一颗螺丝引发的血案

在西姆的维修厂,有一个因果循环的传言,汽车周而复始地来维修厂往往是因为小零件引发的问题. 正在他们谈论这个谣言的时候,老顾客阿杜就把他的一辆K型小车拖进他们维修厂.当老杜把这辆1980年代的古董停到车位的时候,维修工们立刻躲起来,谁都不想碰这辆老古董,天知道会出现什么问题.     

Are travelers substituting between transportation network companies (TNC) and public buses? A case study in Pittsburgh

Transportation - Transportation network companies (TNC) provide mobility services that are influencing travel behavior in unknown ways due to limited TNC trip-level data. How they interact with...     

Perceptions of Diving Impacts and Implications for Reef Conservation

SCUBA diving can contribute to both coral reef degradation and conservation. Divers’ perceptions of these possible impacts were studied in Phuket, Thailand. The most endorsed impact of diving was a positive one: the educational impact on the divers. Impact perceptions changed after the dive. Perceptions of anchor damage and garbage disposal as negative impacts fell markedly. Following the trip liveaboard divers were more likely than day divers to see the impact of diving as positive. Almost 30% of divers witnessed perceived negative impacts on the reef by their dive group. Divers who saw damage were more likely to feel that diving has a negative impact on the reef than divers who did not see impacts. They were also more likely to take part in a reef conservation project. The results reinforce the potential for diving to be a positive force for reef conservation but indicate the need for greater investment in diver education.     

A model for national freight flows,distribution centers,empty trucks and urban truck movements

Trucks travel both short distances for local deliveries and long distances for transporting goods across the country. Often their travel behavior is tour-based, they run under tight schedules and under curfew on selected roads. Despite these differences from personal travel, in practice truck models largely follow person travel methods. To overcome this shortcoming, a two-layer truck model is developed for the Chicago Metropolitan Area. Long-distance trucks are driven by commodity flows, with distribution centers, rail yards, marine ports and airports being represented explicitly. Empty trucks are accounted for as well. For the short-distance truck model, a novel parameter estimation method makes use of limited data to derive region-specific parameters. The model is fully operational and validates reasonably well against traffic counts.     

我的中国杯

离2009年中国杯帆船赛第二场比赛开始还差一分钟，我们被两边的竞争对手挤进了起跑线。船员们都变得哑雀无声，静得连一根针掉在地上都能听见，我们的心跳得越来越快。中国杯帆船赛的第二天没有安排比赛，我们经过了一天休整后，本来很期待能在第三天（即2009年11月1日）有一个好的开始。     

汽车氙灯测试方法：相关性研究

1 背景 在1989年以前,汽车行业没有一个专门的氙灯加速老化测试方法的国际标准.1989年,汽车工程学会(SAE)发布了J1960"水冷式氙灯汽车外饰件加速暴露测试"和SAE J1885"水冷式氙灯汽车内饰件加速暴露测试"两项汽车材料耐候性测试标准.当时,SAE J1960和J1885有利于汽车制造商统一测试条件.但是,这些老化测试标准基于特定型号的设备构造,指定了某生产商的两种型号设备.     

借助列车运行阻力在线测量测定牵引力和制动力

通过在线求得列车运行阻力而无需直接测量,就可测定列车中机车动车的牵引力和制动力.这是一种获得专利的测量方法.这种测量方法用于动车组时,尤其是动力分散的动车组时有许多优点,它也适用于创新的车辆,例如磁悬浮铁路的车辆.